Multiferoics are materials which combine two or more kinds of orderings: ferromagnetism, ferroelectricity, ferroelasticity and ferrotoroidicity. In recent years magnetoelectric multiferoics have cought attention of the scientific community. In these kind of materials is especially good if the magnetisation and electric polarisation are connected, which would mean that we can change magnetisation with electric field and vice-versa. This property of multiferoics is important in hardware industry, magnetoelectric materials can find use in multistate memories or in the devices which would save energy. There are different kinds of multiferoic materials, from oxides: BiFeO3, TbMnO3, HoMn2O5, to metalorganic compounds: [(CH3)3NH2]Mn(HCOO)3, (C6H5CH2CH2NH3)2CuCl4. In this thesis we researched magnetic properties of multiferoic metalorganic compound CuCl4(C2H5NH3)2 with SQUID magnetometer and AC susceptometer. We report measurements and analysis of magnetic phase transition and structural transitions of this compound. Antiferomagnetic phase transition is the consequence of of antiferomagnetic interaction between the neighbouring ferromagnetic ordered planes. We spotted the structural transitions in magnetic measurements which are characterized by jumps and separations of the curves of magnetisation. On the temperatures of the structural transitions organic chains are reorganised by electric field which changes the structure of the compound which then changes the magnetisation of the material. This result implies that magnetoelectric effect can occur indirectly by using the structural transitions of the compund.